Commit 1d521000 authored by Lance Ortiz's avatar Lance Ortiz Committed by Tony Luck
Browse files

aerdrv: Enhanced AER logging 



This patch will provide a more reliable and easy way for user-space
applications to have access to AER logs rather than reading them from the
message buffer. It also provides a way to notify user-space when an AER
event occurs.

The aer driver is updated to generate a trace event of function 'aer_event'
when a PCIe error is reported over the AER interface.  The trace event was
added to both the interrupt based aer path and the firmware first path.

Signed-off-by: default avatarLance Ortiz <lance.ortiz@hp.com>
Acked-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: default avatarBoris Petkov <bp@alien8.de>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 1ca1d8d5

drivers/acpi/apei/cper.c

+16 −3
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include <linux/time.h>

#include <linux/cper.h>

#include <linux/acpi.h>

#include <linux/pci.h>

#include <linux/aer.h>



/*
@@ -249,6 +250,10 @@ static const char *cper_pcie_port_type_strs[] = { 
static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,

			    const struct acpi_hest_generic_data *gdata)

{

#ifdef CONFIG_ACPI_APEI_PCIEAER

	struct pci_dev *dev;

#endif



	if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)

		printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,

		       pcie->port_type < ARRAY_SIZE(cper_pcie_port_type_strs) ?
@@ -281,10 +286,18 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie, 
	"%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",

	pfx, pcie->bridge.secondary_status, pcie->bridge.control);

#ifdef CONFIG_ACPI_APEI_PCIEAER

	if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) {

		struct aer_capability_regs *aer_regs = (void *)pcie->aer_info;

		cper_print_aer(pfx, gdata->error_severity, aer_regs);

	dev = pci_get_domain_bus_and_slot(pcie->device_id.segment,

			pcie->device_id.bus, pcie->device_id.function);

	if (!dev) {

		pr_err("PCI AER Cannot get PCI device %04x:%02x:%02x.%d\n",

			pcie->device_id.segment, pcie->device_id.bus,

			pcie->device_id.slot, pcie->device_id.function);

		return;

	}

	if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO)

		cper_print_aer(pfx, dev, gdata->error_severity,

				(struct aer_capability_regs *) pcie->aer_info);

	pci_dev_put(dev);

#endif

}

drivers/pci/pcie/aer/aerdrv_errprint.c

+8 −1
Original line number Diff line number Diff line
@@ -23,6 +23,9 @@ 


#include "aerdrv.h"



#define CREATE_TRACE_POINTS

#include <trace/events/ras.h>



#define AER_AGENT_RECEIVER		0

#define AER_AGENT_REQUESTER		1

#define AER_AGENT_COMPLETER		2
@@ -194,6 +197,8 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info) 
	if (info->id && info->error_dev_num > 1 && info->id == id)

		printk("%s""  Error of this Agent(%04x) is reported first\n",

			prefix, id);

	trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask),

			info->severity);

}



void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
@@ -217,7 +222,7 @@ int cper_severity_to_aer(int cper_severity) 
}

EXPORT_SYMBOL_GPL(cper_severity_to_aer);



void cper_print_aer(const char *prefix, int cper_severity,

void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity,

		    struct aer_capability_regs *aer)

{

	int aer_severity, layer, agent, status_strs_size, tlp_header_valid = 0;
@@ -259,5 +264,7 @@ void cper_print_aer(const char *prefix, int cper_severity, 
			*(tlp + 8), *(tlp + 15), *(tlp + 14),

			*(tlp + 13), *(tlp + 12));

	}

	trace_aer_event(dev_name(&dev->dev), (status & ~mask),

			aer_severity);

}

#endif

include/linux/aer.h

+2 −2
Original line number Diff line number Diff line
@@ -49,8 +49,8 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) 
}

#endif



extern void cper_print_aer(const char *prefix, int cper_severity,

			   struct aer_capability_regs *aer);

extern void cper_print_aer(const char *prefix, struct pci_dev *dev,

			   int cper_severity, struct aer_capability_regs *aer);

extern int cper_severity_to_aer(int cper_severity);

extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,

			      int severity);

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